2017届高考英语一轮复习考点规范练：20 选修7 Unit 20（北师大版含解析）
<p> 考点规范练20(选修7 <span word="Unit">Unit</span> 20)</p><p> .阅读理解</p><p> <span word="A">A</span></p><p> (2016云南昆明三中第三次综合测试)</p><p> <span word="Mars">Mars</span>(火星) <span word="appears">appears</span> <span word="to">to</span> <span word="be">be</span> <span word="flowing">flowing</span> <span word="with">with</span> <span word="small">small</span> <span word="streams">streams</span> <span word="of">of</span> <span word="salty">salty</span> <span word="water">water</span>,<span word="at">at</span> <span word="least">least</span> <span word="in">in</span> <span word="the">the</span> <span word="summer">summer</span>,<span word="scientists">scientists</span> <span word="reported">reported</span> <span word="Monday">Monday</span>.“<span word="It">It</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="it">it</span> <span word="would">would</span> <span word="be">be</span> <span word="possible">possible</span> <span word="for">for</span> <span word="there">there</span> <span word="to">to</span> <span word="be">be</span> <span word="life">life</span> <span word="today">today</span> <span word="on">on</span> <span word="Mars">Mars</span>,” <span word="NASA">NASA</span>’<span word="s">s</span> <span word="science">science</span> <span word="mission">mission</span> <span word="chief">chief</span>,<span word="John">John</span> <span word="Grunsfeld">Grunsfeld</span>,<span word="said">said</span> <span word="at">at</span> <span word="a">a</span> <span word="news">news</span> <span word="conference">conference</span> <span word="on">on</span> <span word="September">September</span> 28,2015.</p><p> <span word="The">The</span> <span word="streams">streams</span> <span word="are">are</span> <span word="about">about</span> 12 <span word="to">to</span> 15 <span word="feet">feet</span> <span word="wide">wide</span> <span word="and">and</span> 300 <span word="feet">feet</span> <span word="or">or</span> <span word="more">more</span> <span word="long">long</span>,<span word="scientists">scientists</span> <span word="said">said</span>.“<span word="What">What</span> <span word="we">we</span>’<span word="re">re</span> <span word="dealing">dealing</span> <span word="with">with</span> <span word="is">is</span> <span word="wet">wet</span> <span word="soil">soil</span>,<span word="thin">thin</span> <span word="layers">layers</span> <span word="of">of</span> <span word="wet">wet</span> <span word="soil">soil</span>,<span word="not">not</span> <span word="standing">standing</span> <span word="water">water</span>,” <span word="said">said</span> <span word="Alfred">Alfred</span> <span word="McEwen">McEwen</span> <span word="of">of</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Arizona">Arizona</span> <span word="at">at</span> <span word="Tucson">Tucson</span>,<span word="the">the</span> <span word="principal">principal</span> <span word="scientist">scientist</span> <span word="for">for</span> <span word="the">the</span> <span word="Mars">Mars</span> <span word="Reconnaissance">Reconnaissance</span> <span word="Orbiter">Orbiter</span>’<span word="s">s</span> <span word="high">high</span>-<span word="resolution">resolution</span> <span word="imaging">imaging</span> <span word="experiment">experiment</span>.</p><p> <span word="Because">Because</span> <span word="liquid">liquid</span> <span word="water">water</span> <span word="is">is</span> <span word="essential">essential</span> <span word="to">to</span> <span word="life">life</span>,<span word="the">the</span> <span word="findings">findings</span> <span word="could">could</span> <span word="have">have</span> <span word="major">major</span> <span word="implications">implications</span> <span word="for">for</span> <span word="the">the</span> <span word="possibility">possibility</span> <span word="of">of</span> <span word="Martian">Martian</span> <span word="life">life</span>.<span word="The">The</span> <span word="researchers">researchers</span> <span word="said">said</span> <span word="further">further</span> <span word="exploration">exploration</span> <span word="is">is</span> <span word="needed">needed</span> <span word="to">to</span> <span word="determine">determine</span> <span word="whether">whether</span> <span word="microscopic">microscopic</span> <span word="life">life</span> <span word="exists">exists</span> <span word="on">on</span> <span word="the">the</span> <span word="planet">planet</span>.</p><p> <span word="The">The</span> <span word="presence">presence</span> <span word="of">of</span> <span word="liquid">liquid</span> <span word="water">water</span> <span word="could">could</span> <span word="also">also</span> <span word="make">make</span> <span word="life">life</span> <span word="easier">easier</span> <span word="for">for</span> <span word="astronauts">astronauts</span> <span word="visiting">visiting</span> <span word="or">or</span> <span word="living">living</span> <span word="on">on</span> <span word="Mars">Mars</span>.<span word="Water">Water</span> <span word="could">could</span> <span word="be">be</span> <span word="used">used</span> <span word="for">for</span> <span word="drinking">drinking</span> <span word="and">and</span> <span word="for">for</span> <span word="creating">creating</span> <span word="oxygen">oxygen</span> <span word="and">and</span> <span word="rocket">rocket</span> <span word="fuel">fuel</span>.<span word="NASA">NASA</span>’<span word="s">s</span> <span word="goal">goal</span> <span word="is">is</span> <span word="to">to</span> <span word="send">send</span> <span word="humans">humans</span> <span word="there">there</span> <span word="in">in</span> <span word="the">the</span> 2030<span word="s">s</span>.</p><p> <span word="The">The</span> <span word="evidence">evidence</span> <span word="of">of</span> <span word="flowing">flowing</span> <span word="water">water</span> <span word="consists">consists</span> <span word="largely">largely</span> <span word="of">of</span> <span word="dark">dark</span>,<span word="narrow">narrow</span> <span word="streaks">streaks</span> (条痕) <span word="on">on</span> <span word="the">the</span> <span word="surface">surface</span> <span word="that">that</span> <span word="tend">tend</span> <span word="to">to</span> <span word="appear">appear</span> <span word="and">and</span> <span word="grow">grow</span> <span word="during">during</span> <span word="the">the</span> <span word="warmest">warmest</span> <span word="Martian">Martian</span> <span word="months">months</span> <span word="and">and</span> <span word="fade">fade</span> <span word="the">the</span> <span word="rest">rest</span> <span word="of">of</span> <span word="the">the</span> <span word="year">year</span>.</p>
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